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86 lines
2.2 KiB
Markdown
86 lines
2.2 KiB
Markdown
---
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id: 69f35a5bb823ed620fcb7cbd
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title: "Challenge 284: I Before E"
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challengeType: 29
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dashedName: challenge-284
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---
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# --description--
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Given a word or sentence, return a corrected version where every word follows the "I before E except after C" rule.
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- If a word contains `"ei"` not preceded by `"c"`, replace it with `"ie"`.
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- If a word contains `"ie"` preceded by `"c"`, replace it with `"ei"`.
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- All other words are left unchanged.
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# --hints--
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`i_before_e("beleive")` should return `"believe"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(i_before_e("beleive"), "believe")`)
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}})
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```
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`i_before_e("recieve")` should return `"receive"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(i_before_e("recieve"), "receive")`)
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}})
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```
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`i_before_e("we recieved a breif")` should return `"we received a brief"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(i_before_e("we recieved a breif"), "we received a brief")`)
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}})
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```
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`i_before_e("she beleived the friendly niece could percieve the greif")` should return `"she believed the friendly niece could perceive the grief"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(i_before_e("she beleived the friendly niece could percieve the greif"), "she believed the friendly niece could perceive the grief")`)
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}})
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```
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`i_before_e("we recieved relief after the theif gave us a breif piece of feirce deceit")` should return `"we received relief after the thief gave us a brief piece of fierce deceit"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(i_before_e("we recieved relief after the theif gave us a breif piece of feirce deceit"), "we received relief after the thief gave us a brief piece of fierce deceit")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def i_before_e(sentence):
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return sentence
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```
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# --solutions--
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```py
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import re
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def i_before_e(sentence):
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words = []
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for word in sentence.split(" "):
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word = re.sub(r"([^c])ei", r"\1ie", word)
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word = re.sub(r"cie", "cei", word)
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words.append(word)
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return " ".join(words)
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```
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